XML 106 R88.htm IDEA: XBRL DOCUMENT v3.10.0.1
Share-Based Compensation Plans (Schedule of Summary of Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning balance (in shares) 17,165  
Granted (in shares) 5,952  
Exercised (in shares) 0  
Forfeited (in shares) 1,082  
Expired, in shares 3,073  
Outstanding, ending balance (in shares) 18,962 17,165
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price1 [Roll Forward]    
Outstanding, beginning balance, weighted-average exercise price (in dollars per share) $ 14.95  
Granted, weighted-average exercise price (in dollars per share) 3.49  
Exercised, weighted-average exercise price (in dollars per share) 0.00  
Forfeited, weighted-average exercise price (in dollars per share) 5.82  
Expired, weighted-average exercise price (in dollars per share) 34.27  
Outstanding, ending balance, weighted-average exercise price (in dollars per share) $ 9.05 $ 14.95
Exercisable (in shares) 8,679  
Exercisable, weighted-average exercise price (in dollars per share) $ 14.05  
Outstanding, weighted-average contractual term, years 6 years 4 months 24 days
Outstanding, exercisable, weighted-average contractual term, years 4 years 1 month 6 days  
Outstanding, aggregate intrinsic value $ 0.0
Exercisable, aggregate intrinsic value $ 0.0